Waste paper shouldn’t _____ everywhere. It’s our duty to keep our classroom clea
题型：不详难度：来源：
Waste paper shouldn’t _____ everywhere. It’s our duty to keep our classroom clean.
A. be thrown B. throw C. is thrown |
答案
| A |
解析
| 本题的含义是不应该到此乱扔废纸，should为情态动词后加动词原形，本题前半句表示被动的意思，结构为be+过去分词，故本题选A。 |
举一反三
Computers ________widely in our daily life.| A．use | B．used | C．were used | D．are used |
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The worker is made ______ six and a half days a week.
A. work B. working C. to work |
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----- Yes, it ______ every day.
A. is cleaned B. cleans C. is cleaning |
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In the past the children were made ______15 hours a day.| A．to lock | B．work | C．to work | D．lock |
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